// SPDX-FileCopyrightText: 2018 Contributors to Chatterino <https://chatterino.com>
//
// SPDX-License-Identifier: MIT

#include "providers/twitch/TwitchAccount.hpp"

#include "Application.hpp"
#include "common/Channel.hpp"
#include "common/network/NetworkResult.hpp"  // IWYU pragma: keep
#include "common/QLogging.hpp"
#include "controllers/accounts/AccountController.hpp"
#include "controllers/emotes/EmoteController.hpp"
#include "debug/AssertInGuiThread.hpp"
#include "messages/Emote.hpp"
#include "messages/MessageBuilder.hpp"
#include "providers/seventv/SeventvAPI.hpp"
#include "providers/twitch/api/Helix.hpp"
#include "providers/twitch/TwitchCommon.hpp"
#include "providers/twitch/TwitchUsers.hpp"
#include "util/CancellationToken.hpp"
#include "util/QStringHash.hpp"  // IWYU pragma: keep

#include <boost/unordered/unordered_flat_map.hpp>
#include <QStringBuilder>
#include <QThread>
#include <QTimer>

using namespace Qt::Literals::StringLiterals;

namespace chatterino {

TwitchAccount::TwitchAccount(const QString &username, const QString &oauthToken,
                             const QString &oauthClient, const QString &userID)
    : Account(ProviderId::Twitch)
    , oauthClient_(oauthClient)
    , oauthToken_(oauthToken)
    , userName_(username)
    , userId_(userID)
    , isAnon_(username == ANONYMOUS_USERNAME)
    , emoteSets_(std::make_shared<TwitchEmoteSetMap>())
    , emotes_(std::make_shared<EmoteMap>())
{
}

TwitchAccount::~TwitchAccount() = default;

QString TwitchAccount::toString() const
{
    return this->getUserName();
}

const QString &TwitchAccount::getUserName() const
{
    return this->userName_;
}

const QString &TwitchAccount::getOAuthClient() const
{
    return this->oauthClient_;
}

const QString &TwitchAccount::getOAuthToken() const
{
    return this->oauthToken_;
}

const QString &TwitchAccount::getUserId() const
{
    return this->userId_;
}

QColor TwitchAccount::color()
{
    return this->color_.get();
}

void TwitchAccount::setColor(QColor color)
{
    this->color_.set(std::move(color));
}

bool TwitchAccount::setOAuthClient(const QString &newClientID)
{
    if (this->oauthClient_.compare(newClientID) == 0)
    {
        return false;
    }

    this->oauthClient_ = newClientID;

    return true;
}

bool TwitchAccount::setOAuthToken(const QString &newOAuthToken)
{
    if (this->oauthToken_.compare(newOAuthToken) == 0)
    {
        return false;
    }

    this->oauthToken_ = newOAuthToken;

    return true;
}

bool TwitchAccount::isAnon() const
{
    return this->isAnon_;
}

void TwitchAccount::loadBlocks()
{
    assertInGuiThread();

    this->blocksRetryBackoff_.reset();
    this->tryLoadBlocks();
}

void TwitchAccount::tryLoadBlocks()
{
    assertInGuiThread();

    auto token = CancellationToken(false);
    this->blockToken_ = token;
    this->ignores_.clear();
    this->ignoresUserIds_.clear();
    this->ignoresUserLogins_.clear();

    CancellationToken retryToken = token;

    getHelix()->loadBlocks(
        getApp()->getAccounts()->twitch.getCurrent()->userId_,
        [this](const std::vector<HelixBlock> &blocks) {
            assertInGuiThread();

            for (const HelixBlock &block : blocks)
            {
                TwitchUser blockedUser;
                blockedUser.fromHelixBlock(block);
                this->ignores_.insert(blockedUser);
                this->ignoresUserIds_.insert(blockedUser.id);
                this->ignoresUserLogins_.insert(blockedUser.name);
            }
        },
        [this, retryToken](const QString &error) {
            if (retryToken.isCancelled())
            {
                return;
            }
            qCWarning(chatterinoTwitch).noquote()
                << "Fetching blocks failed:" << error << "- retrying";
            auto delay = this->blocksRetryBackoff_.next();
            QTimer::singleShot(delay, [this, retryToken] {
                if (retryToken.isCancelled())
                {
                    return;
                }
                this->tryLoadBlocks();
            });
        },
        std::move(token));
}

void TwitchAccount::blockUser(const QString &userId, const QString &userLogin,
                              const QObject *caller,
                              std::function<void()> onSuccess,
                              std::function<void()> onFailure)
{
    getHelix()->blockUser(
        userId, caller,
        [this, userId, userLogin, onSuccess = std::move(onSuccess)] {
            assertInGuiThread();

            TwitchUser blockedUser;
            blockedUser.id = userId;
            blockedUser.name = userLogin;
            this->ignores_.insert(blockedUser);
            this->ignoresUserIds_.insert(blockedUser.id);
            this->ignoresUserLogins_.insert(blockedUser.name);
            onSuccess();
        },
        std::move(onFailure));
}

void TwitchAccount::unblockUser(const QString &userId, const QString &userLogin,
                                const QObject *caller,
                                std::function<void()> onSuccess,
                                std::function<void()> onFailure)
{
    getHelix()->unblockUser(
        userId, caller,
        [this, userId, userLogin, onSuccess = std::move(onSuccess)] {
            assertInGuiThread();

            TwitchUser ignoredUser;
            ignoredUser.id = userId;
            ignoredUser.name = userLogin;
            this->ignores_.erase(ignoredUser);
            this->ignoresUserIds_.erase(ignoredUser.id);
            this->ignoresUserLogins_.erase(ignoredUser.name);
            onSuccess();
        },
        std::move(onFailure));
}

void TwitchAccount::blockUserLocally(const QString &userID,
                                     const QString &userLogin)
{
    assertInGuiThread();
    assert(getApp()->isTest());

    TwitchUser blockedUser;
    blockedUser.id = userID;
    blockedUser.name = userLogin;
    this->ignores_.insert(blockedUser);
    this->ignoresUserIds_.insert(blockedUser.id);
    this->ignoresUserLogins_.insert(blockedUser.name);
}

bool TwitchAccount::setUserName(const QString &newUserName)
{
    if (this->userName_.compare(newUserName, Qt::CaseInsensitive) == 0)
    {
        return false;
    }
    this->userName_ = newUserName;
    return true;
}

const std::unordered_set<TwitchUser> &TwitchAccount::blocks() const
{
    assertInGuiThread();
    return this->ignores_;
}

const std::unordered_set<QString> &TwitchAccount::blockedUserIds() const
{
    assertInGuiThread();
    return this->ignoresUserIds_;
}

const std::unordered_set<QString> &TwitchAccount::blockedUserLogins() const
{
    assertInGuiThread();
    return this->ignoresUserLogins_;
}

// AutoModActions
void TwitchAccount::autoModAllow(const QString &msgID, ChannelPtr channel) const
{
    getHelix()->manageAutoModMessages(
        this->getUserId(), msgID, "ALLOW",
        [] {
            // success
        },
        [channel](auto error) {
            // failure
            QString errorMessage("Failed to allow AutoMod message - ");

            switch (error)
            {
                case HelixAutoModMessageError::MessageAlreadyProcessed: {
                    errorMessage += "message has already been processed.";
                }
                break;

                case HelixAutoModMessageError::UserNotAuthenticated: {
                    errorMessage += "you need to re-authenticate.";
                }
                break;

                case HelixAutoModMessageError::UserNotAuthorized: {
                    errorMessage +=
                        "you don't have permission to perform that action";
                }
                break;

                case HelixAutoModMessageError::MessageNotFound: {
                    errorMessage += "target message not found.";
                }
                break;

                // This would most likely happen if the service is down, or if the JSON payload returned has changed format
                case HelixAutoModMessageError::Unknown:
                default: {
                    errorMessage += "an unknown error occurred.";
                }
                break;
            }

            channel->addSystemMessage(errorMessage);
        });
}

void TwitchAccount::autoModDeny(const QString &msgID, ChannelPtr channel) const
{
    getHelix()->manageAutoModMessages(
        this->getUserId(), msgID, "DENY",
        [] {
            // success
        },
        [channel](auto error) {
            // failure
            QString errorMessage("Failed to deny AutoMod message - ");

            switch (error)
            {
                case HelixAutoModMessageError::MessageAlreadyProcessed: {
                    errorMessage += "message has already been processed.";
                }
                break;

                case HelixAutoModMessageError::UserNotAuthenticated: {
                    errorMessage += "you need to re-authenticate.";
                }
                break;

                case HelixAutoModMessageError::UserNotAuthorized: {
                    errorMessage +=
                        "you don't have permission to perform that action";
                }
                break;

                case HelixAutoModMessageError::MessageNotFound: {
                    errorMessage += "target message not found.";
                }
                break;

                // This would most likely happen if the service is down, or if the JSON payload returned has changed format
                case HelixAutoModMessageError::Unknown:
                default: {
                    errorMessage += "an unknown error occurred.";
                }
                break;
            }

            channel->addSystemMessage(errorMessage);
        });
}

const QString &TwitchAccount::getSeventvUserID() const
{
    return this->seventvUserID_;
}

void TwitchAccount::loadSeventvUserID()
{
    if (this->isAnon())
    {
        return;
    }
    if (!this->seventvUserID_.isEmpty())
    {
        return;
    }

    auto *seventv = getApp()->getSeventvAPI();
    if (!seventv)
    {
        qCWarning(chatterinoSeventv)
            << "Not loading 7TV User ID because the 7TV API is not initialized";
        return;
    }

    seventv->getUserByTwitchID(
        this->getUserId(),
        [this](const auto &json) {
            const auto id = json["user"]["id"].toString();
            if (!id.isEmpty())
            {
                this->seventvUserID_ = id;
            }
        },
        [](const auto &result) {
            qCDebug(chatterinoSeventv)
                << "Failed to load your 7TV user-id:" << result.formatError();
        });
}

bool TwitchAccount::hasEmoteSet(const EmoteSetId &id) const
{
    auto emotes = this->emoteSets_.accessConst();
    return emotes->get()->contains(id);
}

SharedAccessGuard<std::shared_ptr<const TwitchEmoteSetMap>>
    TwitchAccount::accessEmoteSets() const
{
    return this->emoteSets_.accessConst();
}

SharedAccessGuard<std::shared_ptr<const EmoteMap>> TwitchAccount::accessEmotes()
    const
{
    return this->emotes_.accessConst();
}

void TwitchAccount::setEmotes(std::shared_ptr<const EmoteMap> emotes)
{
    assert(getApp()->isTest());
    *this->emotes_.access() = std::move(emotes);
}

std::optional<EmotePtr> TwitchAccount::twitchEmote(const EmoteName &name) const
{
    auto emotes = this->emotes_.accessConst();
    auto it = (*emotes)->find(name);
    if (it != (*emotes)->end())
    {
        return it->second;
    }
    return std::nullopt;
}

void TwitchAccount::reloadEmotes(void *caller)
{
    if (this->isAnon() || getApp()->isTest())
    {
        return;
    }

    CancellationToken token(false);
    this->emoteToken_ = token;

    auto sets = std::make_shared<TwitchEmoteSetMap>();
    auto emoteMap = std::make_shared<EmoteMap>();
    auto nCalls = std::make_shared<size_t>();

    auto *twitchEmotes = getApp()->getEmotes()->getTwitchEmotes();
    auto *twitchUsers = getApp()->getTwitchUsers();

    auto addEmote = [sets, emoteMap, twitchEmotes,
                     twitchUsers](const HelixChannelEmote &emote) {
        EmoteId id{emote.id};
        EmoteName name{emote.name};
        auto meta = getTwitchEmoteSetMeta(emote);

        auto emotePtr = twitchEmotes->getOrCreateEmote(id, name);
        if (!emoteMap->try_emplace(emotePtr->name, emotePtr).second)
        {
            // if the emote already exists, we don't want to add it to a set as
            // those are assumed to be disjoint
            return;
        }

        auto set = sets->find(EmoteSetId{meta.setID});
        if (set == sets->end())
        {
            auto owner = [&]() {
                if (meta.isSubLike)
                {
                    return twitchUsers->resolveID({emote.ownerID});
                }

                return std::make_shared<TwitchUser>(TwitchUser{
                    .id = u"[x-c2-global-owner]"_s,
                    .name = {},
                    .displayName = {},
                });
            }();
            set = sets->emplace(EmoteSetId{meta.setID},
                                TwitchEmoteSet{
                                    .owner = owner,
                                    .emotes = {},
                                    .isBits = meta.isBits,
                                    .isSubLike = meta.isSubLike,
                                })
                      .first;
        }
        set->second.emotes.emplace(emotePtr->name, std::move(emotePtr));
    };

    auto userID = this->getUserId();
    qDebug(chatterinoTwitch).nospace()
        << "Loading Twitch emotes - userID: " << userID
        << ", broadcasterID: none, manualRefresh: " << (caller != nullptr);

    getHelix()->getUserEmotes(
        this->getUserId(), {},
        [this, caller, emoteMap, sets, addEmote, nCalls](
            const auto &emotes, const auto &state) mutable {
            assert(emoteMap && sets);
            (*nCalls)++;
            qDebug(chatterinoTwitch).nospace()
                << "Got " << emotes.size() << " more emote(s)";

            emoteMap->reserve(emoteMap->size() + emotes.size());
            for (const auto &emote : emotes)
            {
                addEmote(emote);
            }

            if (state.done)
            {
                qDebug(chatterinoTwitch).nospace()
                    << "Loaded " << emoteMap->size() << " Twitch emotes ("
                    << *nCalls << " requests)";

                *this->emotes_.access() = std::move(emoteMap);
                *this->emoteSets_.access() = std::move(sets);
                getApp()->getAccounts()->twitch.emotesReloaded.invoke(caller,
                                                                      {});
            }
        },
        [caller](const auto &error) {
            qDebug(chatterinoTwitch)
                << "Failed to load Twitch emotes:" << error;
            getApp()->getAccounts()->twitch.emotesReloaded.invoke(
                caller, makeUnexpected(error));
        },
        std::move(token));
}

}  // namespace chatterino
